Method and apparatus for generating video packets, method and apparatus for restoring video

A method of restoring video, the method comprising:

• receiving a plurality of packets associated with pixels of a video frame;
• classifying the plurality of packets based on whether each of the plurality of packets is a first packet including pixel values of reference pixels, a second packet including pixel difference values which are difference values between pixel values of the pixels, or a third packet in which entropy coding has been performed for pixel difference values, wherein the entropy coding has been selectively applied to only a subset of packets and the subset of packets to which the entropy coding is applied are determined based on positions of pixels in one pixel block, the subset being fewer than all packets including the pixel difference values;
• performing pulse code modulation decoding, without performing entropy decoding, of first packets based on a result of the classifying;
• performing pulse code modulation decoding, without performing entropy decoding, of second packets based on a result of the classifying;
• performing entropy decoding of the third packet based on a result of the classifying;
• and
• restoring the video frame based on the pixel values of the reference pixels of the first packet, the pixel difference values of the second packet, and the pixel difference values of the decoded third packet.

An apparatus for generating video packets, the apparatus comprising:

• a pixel block generator which generates at least one pixel block consisting of at least one reference pixel and a plurality of neighboring pixels adjacent to the at least one reference pixel from pixels of a video frame;
• a pixel value management unit which replaces pixel values of the neighboring pixels in the at least one pixel block with pixel difference values, which are difference values between a pixel value of one of pixels adjacent to the neighboring pixels and the pixel values of the neighboring pixels;
• a packet generator which generates packets so that a pixel value of the at least one reference pixel and the pixel difference values of the neighboring pixels are allocated to different packets according to positions of the pixels;
• and
• a coder which determines whether a packet includes the reference pixel, performs pulse code modulation coding, without performing entropy coding, of packets including the reference pixel based on a result of the determination, and selectively performs entropy coding of packets that do not include the reference pixel based on the result of the determination,
• wherein the entropy coding is applied to a first subset of packets including the pixel difference values and the pulse code modulation coding is applied, without performing entropy coding, to a second subset of packets including the pixel difference values, the second subset of packets being different from the first subset of packets, and
• wherein the packets to which the entropy coding is applied are determined based on positions of pixels in the at least one pixel block.

An apparatus for restoring video, the apparatus comprising:

• a receiver which receives a plurality of packets associated with pixels of a video frame;
• a packet classifier which classifies the plurality of packets based on whether each of the plurality of packets is a first packet including pixel values of reference pixels, a second packet including pixel difference values which are difference values between pixel values of the pixels, or a third packet in which entropy coding has been performed for pixel difference values, wherein the entropy coding has been selectively applied to only a subset of packets and the subset of packets to which the entropy coding is applied are determined based on positions of pixels in one pixel block, the subset being fewer than all packets including the pixel difference values;
• a decoder which performs pulse code modulation decoding, without performing entropy decoding, of first packets based on a result of the classification by the packet classifier, performs pulse code modulation decoding, without performing entropy decoding, of second packets based on a result of the classification by the packet classifier, and performs entropy decoding of the third packet based on a result of the classification by the packet classifier;
• and
• a restorer which restores the video frame based on the pixel values of the reference pixels of the first packet, the pixel difference values of the second packet, and the pixel difference values of the decoded third packet.